//
// Created by 刘彪 on 2020/3/2.
//运行结果应该不对 todo 继承与派生 P228
#include <iostream>
#include <cmath>
using namespace std;
class Point{
protected:
double x,y;
public:
Point(){}
Point(double a,double b){
x = a;
y = b;
}
double getx(){return x;}
double gety(){return y;}
};
class Line{
protected:
Point p1,p2;
double length,angle;
public:
Line(double a, double b,double c,double d):p1(a,b),p2(c,d){
init();
}
Line(Point a,Point b){
p1 = a;
p2 = b;
init();
}
void init(){
double x1 = p1.getx(),y1 = p1.gety();
double x2 = p2.getx(),y2 = p2.gety();
length = sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2));
angle = atan((y2-y1)/(x2-x1));
angle = angle*180/3.1415926;
}
void dispxy(){
cout<<"("<<p1.getx()<<","<<p1.gety()<<");("<<p2.getx()<<","<<p2.gety()<<")"<<endl;
}
void printLength(){
cout<<"线段长度:"<<length<<endl;
}
void printAngle(){
cout<<"与x轴的夹角:"<<angle<<"°"<<endl;
}
};
class Rectangle:public Line{
protected:
Line *line;
public:
Rectangle(double a, double b,double c,double d,double e,double f,double g,double h):Line(a,b,c,d){
line = new Line(e,f,g,h);
}
Rectangle(Point a,Point b,Point c,Point d):Line(a,b){
line = new Line(c,d);
}
void disPoint(){
cout<<"矩形4个顶点:\n";
dispxy();
line->dispxy();
}
};
int main(){
Point p1(0,0),p2(4,3),p3(12,89),p4(10,-50);
Line l1(0,0,4,3);
l1.dispxy();
l1.printLength();
l1.printAngle();
Line l2(p1,p2);
l2.dispxy();
l2.printLength();
l2.printAngle();
Rectangle r1(12,45,89,10,10,23,56,1);
r1.disPoint();
Rectangle r2(p1,p2,p3,p4);
r2.disPoint();
return 0;
} 
